HD-7 do you know any answers??

[440icd]

Again I know this isn't a Allis site but I bet some one can hep.

Iam going to look at this HD7 one last time on Thursday after work and I really need some input on a few things on this dozer.
So if you can help me it would really help. So please post up and reply.

#1 I noticed on the rear track sprocket it is kind of funny looking, I mean the sprockets do not have points on them at all. Like my John Deere 440icd, or any other track machine I have ever seen, the chain link appears to drive into a slot cut into the rear sprocket.
I mean there is no sharp tip to the sprocket at all, just a cut out for the chain to grab.
What the heck kind of set up is this?

#2 How do I check to see if the tracks and chain are wore out????
Is there a web site somewhere that shows how to do this??

#3 where is the fuel pump on this dozer, it’s a 3-71.
#4 are the injectors mounted in the head like the 2-53
#5 is the a 24 volt dozer